import gradio as gr
from huggingface_hub import InferenceClient

def respond(message, history: list[dict[str,str]], system_message, max_tokens, temperature, top_p, hf_token):
    if not hf_token:
        yield "⚠️ You must login first! (Bạn phải đăng nhập trước!)"
        return

    client = InferenceClient(token=hf_token.token, model="openai/gpt-oss-20b")
    
    messages = [{"role": "system", "content": system_message}]
    messages.extend([m for m in history if m.get("role") in ["user","assistant"] and "content" in m])
    messages.append({"role": "user", "content": message})
    
    response = ""
    try:
        for message_chunk in client.chat_completion(
            messages,
            max_tokens=max_tokens,
            stream=True,
            temperature=temperature,
            top_p=top_p,
        ):
            token = message_chunk.choices[0].delta.get("content","") if message_chunk.choices else ""
            response += token
            yield response
    except Exception as e:
        yield f"❌ Error: {e}"

with gr.Blocks(css=".gradio-container {background-color: #1a1a1a; color: #eee;}") as demo:
    with gr.Row():
        # Sidebar
        with gr.Column(scale=3, min_width=300):
            gr.Markdown("## ⚡ Login & Settings (Đăng nhập & Cài đặt)")
            hf_token = gr.LoginButton()
            gr.Markdown("Login to HF (Đăng nhập HF)")
            system_message = gr.Textbox(value="You are a friendly Chatbot. (Bạn là chatbot thân thiện.)", label="System message", lines=2)
            max_tokens = gr.Slider(minimum=1, maximum=2048, value=512, step=1, label="Max tokens")
            temperature = gr.Slider(minimum=0.1, maximum=4.0, value=0.7, step=0.1, label="Temperature")
            top_p = gr.Slider(minimum=0.1, maximum=1.0, value=0.95, step=0.05, label="Top-p (nucleus sampling)")
        
        # Chat area
        with gr.Column(scale=7):
            chatbot = gr.Chatbot(label="AI Chat (Trò chuyện với AI)").style(height=600)
            with gr.Row():
                msg = gr.Textbox(placeholder="Type your message here... (Gõ tin nhắn vào đây)", lines=1)
                submit = gr.Button("Send (Gửi)")
    
    # Bind events
    submit.click(
        respond,
        inputs=[msg, chatbot, system_message, max_tokens, temperature, top_p, hf_token],
        outputs=chatbot
    )
    msg.submit(
        respond,
        inputs=[msg, chatbot, system_message, max_tokens, temperature, top_p, hf_token],
        outputs=chatbot
    )

if __name__ == "__main__":
    demo.launch()